I watched the video ...she is not wearing a tiara...she is wearing a diamond
headband...lol

Looked at it again and you might be right. Still, a diamond headband? I mean, puhleeze. It's needlessly ostentatious and cheesy to wear a diamond tiara/headband, diamond whatever, on your head to meet a guy for the first time (or second or third or tenth) even if it's in a palatial setting and he's a Prince. Especially since he's a Prince.... and she's neither a beauty queen with a legit, current beauty title, nor a little girl nor a Princess.

Either she's projecting that she's not a golddigger and she, or rather her daddy, can afford diamond headbands or that she's desperate to say that she belongs in his "world". Or she's just a cheesy, ostentatious, tasteless person. Or all of these combined.

Italian lady is that Jessica instead...her hair looks to dark to be italian
lady but I could be wrong

Jessica

Let me go back to how we came to thinking the lady was one of the Italian gals. It was when the two ladies came during the ceremony outside, and the one gal in white looked just like this girl, and is in another shot brushing the prince's hair.